added test data directories for start_parallel_jobs*
added test data for normalize_by_copy_number
adding test data for predict_metagenomes.py
updated usage example
Merge pull request #99 from gregcaporaso/issue-97

work on script usage examples and test data
Implement script_info in print_picrust_config.py

Fixes #96
Merge pull request #102 from mlangill/issue96

Implement script_info in print_picrust_config.py